HONG KONG -- Hong Kong police say they've arrested six crew members from the two boats involved in a collision that left 37 people dead.

Police Commissioner Tsang Wai-hung said Tuesday that crew members from both boats were detained. He says they are suspected of endangering passengers by operating the craft unsafely, but he gave no other details.

Salvage crews were raising the Lamma IV, which sank after colliding with a ferry Monday night as it carried partygoers to a fireworks show celebrating China's national day. A body found aboard the vessel Tuesday afternoon raising the death toll to 37. More than 100 people were sent to a hospital.

Police were interviewing survivors to determine if others were missing. The accident, Hong Kong's deadliest in more than a decade, is under investigation.